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Recognition of Sensor Failure of Sensor Inputs
The thresholds at which the sensor fails, that is, sensor breaks (SB) and short-circuits (SC), are recognized,
depending upon the given sensor type. In the event of a recognized sensor failure, the sensor assumes the safety
values configured in Table 31 on page 40. It lists the measurement ranges and the corresponding thresholds for the
recognized sensor failure for the various types of sensor:
Table 32 Thresholds for Short-circuit (SC) and Sensor-break (SB) Recognition
I/O
Configuration
2 to 10 V
2 to 10 VDC 4 to 20 mA (without pull-up)
10 k NTC Ω (Type II) -22 °F to +212 °F (-30 °C to +100 °C)
20 k NTC Ω
-58 °F to +302 °F (-50 °C to +150 °C)
PT1000
-58 °F to +752 °F (-50 °C to + 400 °C)
NI1000TK5000
-22 °F to +266 °F (-30 °C to +130 °C)
PT100
-58 °F to +752 °F (-50 °C to +400 °C)
PT3000
-58 °F to +302 °F (-50 °C to +150 °C)
10K3A1
-40 °F to +257 °F (-40 °C to +125 °C)
Nickel Class B DIN
-76 °F to +752 °F (-60 °C to +169 °C)
43760 sensors
NOTE:
In the case of temperatures lying outside the ranges, the lowest and highest value within the range, will be
communicated. Thus, a temperature of -51 °F (-46 °C) will be communicated as -50 °F (-45 °C).
HONEYWELL UNITARY CONTROLLER - 230 VAC - INSTALLATION INSTRUCTIONS
Measurement Range
41
Recognition Thresholds
SC: < 1.5 VDC 3 mA; SB: no recognition
SC: < 20 Ω; SB: < -94 °F (-70 °C)
SC: < 20 Ω; SB: < -94 °F (-70 °C)
SC: < 775 Ω; SB: < -58 °F (-50 °C)
SC: < 850 Ω; SB: < -58 °F (-30 °C)
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31-00610-01
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